Silver moon pendant necklace, 18-inch chain

I lost my silver moon pendant necklace yesterday around 4pm near the Bristol Central Library on College Green. It's an 18-inch silver-tone chain with a small crescent moon pendant and a tiny cubic zirconia at the tip. The chain is a little tarnished and the clasp sticks sometimes. On the back there's a tiny engraving 'LJ' for quick identification. It was a gift from my grandmother, so this really means a lot to me and I’d be grateful to get it back.